Account for the TMDS clock limits declared by the DFP
when determining what color depth we're going to use.

v2: Drop the reference to DP++ dongle since it's not handled here
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200904115354.25336-17-ville.syrjala@linux.intel.comReviewed-by: NLyude Paul <lyude@redhat.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>